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Fuzzballs to Firewalls: A Post-Firewall Review of the Fuzzball Proposal: Lecture 2

The fuzzball proposal makes a conjecture about the nature of black holemicrostates. Now, more than a decade old and including several different

philosophies and perspectives, it is especially relevant after the recent

firewall argument and ensuing debate. Over three lectures, I plan to startwith a very general discussion of the general ideas and motivations, thenreview the theoretical evidence from string theory, and finally close bydiscussing open questions, including the fate of a freely falling observeras he/she passes through the black hole horizon.